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<h1>navo/algorithm/crypto/symmetric/rc4.c</h1>  </div>
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<a href="rc4_8c.html">浏览该文件的文档。</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */</span>
<a name="l00011"></a>00011 <span class="preprocessor">#ifdef _MSC_VER</span>
<a name="l00012"></a>00012 <span class="preprocessor"></span><span class="preprocessor">#pragma optimize(&quot;t&quot;, on)</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#endif  </span><span class="comment">/* #ifdef _MSC_VER */</span>
<a name="l00014"></a>00014 
<a name="l00015"></a>00015 <span class="preprocessor">#include &quot;<a class="code" href="rc4_8h.html" title="RC4.">rc4.h</a>&quot;</span>
<a name="l00016"></a>00016 
<a name="l00017"></a>00017 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {
<a name="l00019"></a>00019 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00020"></a>00020 
<a name="l00021"></a>00021 <span class="preprocessor">#define FN(a, b) (((a) + (b)) &amp; 0xFF)</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span>
<a name="l00023"></a>00023 NV_IMPL <span class="keywordtype">void</span> __rc4_set_key(<a class="code" href="structrc4__key.html" title="RC4密钥">rc4_key</a>* key, uint32_t* s, 
<a name="l00024"></a>00024                             <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* src_key, <span class="keywordtype">size_t</span> cnt)
<a name="l00025"></a>00025 {
<a name="l00026"></a>00026     <span class="keywordtype">int</span> i, j = 0, k = 0;
<a name="l00027"></a>00027     
<a name="l00028"></a>00028     key-&gt;<a class="code" href="structrc4__key.html#aae8a40a17c0be29c1f06ca6b4f9e2235" title="x">x</a> = 1;
<a name="l00029"></a>00029     key-&gt;<a class="code" href="structrc4__key.html#a9c02f93c9698e4486878867c4f265c48" title="y">y</a> = 0;
<a name="l00030"></a>00030 
<a name="l00031"></a>00031     <span class="keywordflow">for</span> (i = 0; i &lt; 256; ++i)
<a name="l00032"></a>00032         s[i] = i;
<a name="l00033"></a>00033 
<a name="l00034"></a>00034     <span class="keywordflow">for</span> (i = 0; i &lt; 256; ++i) {
<a name="l00035"></a>00035         uint32_t t = s[i];
<a name="l00036"></a>00036         j = FN(j + t, src_key[k]);
<a name="l00037"></a>00037         s[i] = s[j];
<a name="l00038"></a>00038         s[j] = t;
<a name="l00039"></a>00039         <span class="keywordflow">if</span> (++k &gt;= cnt)
<a name="l00040"></a>00040             k = 0;
<a name="l00041"></a>00041     }
<a name="l00042"></a>00042 }
<a name="l00043"></a>00043 
<a name="l00044"></a>00044 NV_IMPL <span class="keywordtype">void</span> __rc4_crypt(<a class="code" href="structrc4__key.html" title="RC4密钥">rc4_key</a>* key, uint32_t* s, 
<a name="l00045"></a>00045                     <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* out, <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* in, <span class="keywordtype">size_t</span> cnt)
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047     uint32_t ty, ta, tb;
<a name="l00048"></a>00048     uint32_t x = key-&gt;<a class="code" href="structrc4__key.html#aae8a40a17c0be29c1f06ca6b4f9e2235" title="x">x</a>;
<a name="l00049"></a>00049     uint32_t a = s[x];
<a name="l00050"></a>00050     uint32_t y = FN(key-&gt;<a class="code" href="structrc4__key.html#a9c02f93c9698e4486878867c4f265c48" title="y">y</a>, a);
<a name="l00051"></a>00051     uint32_t b = s[y];
<a name="l00052"></a>00052 
<a name="l00053"></a>00053     <span class="keywordflow">while</span> (1) {
<a name="l00054"></a>00054         s[y] = a;
<a name="l00055"></a>00055         a = FN(a, b);
<a name="l00056"></a>00056         x = FN(x, 1);
<a name="l00057"></a>00057         ta = s[x];
<a name="l00058"></a>00058         ty = FN(y, ta);
<a name="l00059"></a>00059         tb = s[ty];
<a name="l00060"></a>00060         *out++ = *in++ ^ s[a];
<a name="l00061"></a>00061         <span class="keywordflow">if</span> (!(--cnt))
<a name="l00062"></a>00062             <span class="keywordflow">break</span>;
<a name="l00063"></a>00063         y = ty;
<a name="l00064"></a>00064         a = ta;
<a name="l00065"></a>00065         b = tb;
<a name="l00066"></a>00066     }
<a name="l00067"></a>00067 
<a name="l00068"></a>00068     key-&gt;<a class="code" href="structrc4__key.html#aae8a40a17c0be29c1f06ca6b4f9e2235" title="x">x</a> = x;
<a name="l00069"></a>00069     key-&gt;<a class="code" href="structrc4__key.html#a9c02f93c9698e4486878867c4f265c48" title="y">y</a> = y;
<a name="l00070"></a>00070 }
<a name="l00071"></a>00071 
<a name="l00072"></a>00072 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span>}
<a name="l00074"></a>00074 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00075"></a>00075 
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